High Procalcitonin Signals Vascular Damage and Worse Outcomes in Pediatric Sepsis
Children with sepsis and elevated procalcitonin show measurable microvascular dysfunction, higher organ failure rates, and increased mortality.
Summary
A Colombian study of 230 children with sepsis found that nearly half had hyperprocalcitonemia — procalcitonin above 2 ng/mL — at PICU admission. These children showed significantly worse microcirculatory blood flow at 24 and 48 hours, along with higher levels of endothelial injury markers like syndecan-1 and angiopoietin-2. When severe endothelial and microvascular dysfunction occurred together with high procalcitonin, children faced more than double the odds of dangerous fluid overload, nearly double the odds of multiple organ dysfunction, and 66% higher odds of death. The findings suggest that procalcitonin is not just an infection marker but a signal of vascular injury, and that protecting microvascular integrity could be a meaningful therapeutic target in pediatric critical care.
Detailed Summary
Sepsis remains a leading cause of death in children worldwide, and identifying which patients are at highest risk for catastrophic deterioration is a critical clinical challenge. This study explores whether elevated procalcitonin — a widely used infection biomarker — also reflects underlying vascular damage that drives poor outcomes.
Researchers enrolled 230 children admitted to a tertiary PICU in Bogotá, Colombia between 2021 and 2024 with sepsis or septic shock. Procalcitonin was measured at admission, 24 hours, and 48 hours. Simultaneously, the team assessed microcirculation using sublingual videomicroscopy and measured three endothelial injury biomarkers: syndecan-1, angiopoietin-2, and endocan. Hyperprocalcitonemia was defined as procalcitonin greater than 2 ng/mL.
At admission, 43.9% of children met the hyperprocalcitonemia threshold. After adjusting for confounders, these children had significantly higher odds of reduced capillary blood flow at both 24 hours (aOR 1.35) and 48 hours (aOR 1.14). They also showed elevated syndecan-1 — a marker of glycocalyx shedding and endothelial breakdown — and more than double the odds of angiopoietin-2 elevation, which signals vascular instability. When hyperprocalcitonemia coincided with severe endothelial and microcirculatory dysfunction, the combined phenotype was associated with fluid overload exceeding 10% (aOR 2.01), multiple organ dysfunction (aOR 1.87), and mortality (aOR 1.66).
These findings reframe procalcitonin as a potential marker of vascular injury, not merely infection severity. The data suggest a distinct high-risk phenotype in pediatric sepsis defined by concurrent inflammatory and microvascular compromise.
Clinically, this points toward microvascular integrity as a therapeutic target — interventions that protect the endothelial glycocalyx or restore capillary flow may improve survival. Caveats include single-center design, a Colombian PICU population that may not generalize broadly, and the fact that this summary is based on the abstract only.
Key Findings
- 44% of children with sepsis had hyperprocalcitonemia; these patients showed reduced capillary blood flow at 24 and 48 hours.
- Hyperprocalcitonemia was linked to 2.28x higher odds of angiopoietin-2 elevation, a marker of vascular instability.
- Combined hyperprocalcitonemia and severe endothelial dysfunction doubled the odds of dangerous fluid overload (>10%).
- The high-procalcitonin phenotype was associated with 66% higher odds of mortality after adjusting for confounders.
- Microvascular integrity is proposed as a therapeutic target to reduce organ failure and death in pediatric sepsis.
Methodology
Prospective observational cohort study of 230 children with sepsis or septic shock in a 15-bed tertiary PICU in Bogotá, Colombia (2021–2024). Microcirculation was assessed via sublingual videomicroscopy alongside serial procalcitonin and endothelial biomarker measurements at admission, 24 hours, and 48 hours. Multivariable logistic regression was used to adjust for confounders.
Study Limitations
Single-center study from one Colombian PICU limits generalizability to other healthcare settings and patient populations. This summary is based on the abstract only, so full methodology, subgroup analyses, and supplementary data could not be reviewed. Observational design precludes causal inference between hyperprocalcitonemia and microvascular dysfunction.
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